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Looking for spectra of SAO 138885 & 138886

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#1 ssmith

ssmith

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Posted 06 June 2020 - 09:36 AM

I have been looking at Color Contrasting double stars and comparing their color differences to the differences in their spectral class (by subtype).  When I plot these differences there is a reasonable correlation as seen below.  One of my data points is the optical pair S639 in Virgo which is a clear outlier looking at my plot and I suspect the spectral class of the magnitude 10 secondary which is listed as K0 in Simbad is in error.  Looking at the color index of the secondary and my photo I suspect that it perhaps is at least a late F or early G star. Sky Safari lists the spectra of the primary as M0 III which does help a bit.  Any chance those of you here on this forum with spectrographs could take a look at these two stars?

 

 

 


Edited by ssmith, 06 June 2020 - 01:01 PM.

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